Precise definition of each primitive is critical in terms of defining an aspect model that consists of elements that are defined by a set of primitives, as explained in the previous section.

• 在定义一个特征模型包含的要素并由此定义一个参数集合这方面，精确定义每一个基元是至关重要的，这在先前的章节中已经解释过了。